manage_posts_columns

How to add a column with Featured Thumbnail to wp-admin without using plugins. You can specify the size of the thumbnail using the_post_thumbnail(). add_filter(‘manage_posts_columns’, ‘posts_columns’, 5); add_action(‘manage_posts_custom_column’, ‘posts_custom_columns’, 5, 2); function posts_columns($defaults){ $defaults[‘show_post_thumbnail’] = __(‘Thumbnail’); return $defaults; } function posts_custom_columns($column_name, $id){ if($column_name === ‘show_post_thumbnail’){ // echo the_post_thumbnail( ‘thumbnail’ ); echo the_post_thumbnail( array(50,50) ); } }